Collisionless spin waves in normal and superfluid /sup 3/He

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681488· OSTI ID:5571049

Candela, D; Masuhara, N; Sherrill, D S; Edwards, D O

Standing spin-wave modes in liquid /sup 3/He have been studied by c-italicw-italic AiNM-italicR-italic at Larmor frequencies of 1,2, and 4 M-italicH-italicz and pressures of 0, 6.3, and 12.3 bar. The spin waves, which produce peaks in the N-italicM-italicR-italic line, are visible at temperatures below 5 m-italicK-italic at zero pressure. With the assumption of a slightly simplified sample shape and no transverse spin relaxation at the walls, the theory of Leggett fits the spin-wave frequencies in the normal liquid very well, giving a value of the Fermi liquid parameter F/sub 1//sup a/ = -0.6 +- 0.2 at zero pressure. The width of some of the peaks is larger than expected from other determinations of the quasiparticle diffusion time tau/sub D/. This could be due to wall relaxation or to deviations from the assumed sample geometry. In the superfluid A-italic/sub 1/ and A-italic phases, where the data cannot be fitted to existing theories, the spin-wave modes are shifted in frequency and suffer additional damping as the temperature is decreased. At still lower temperatures in the B phase an inversion of the spin-wave modes are shifted in frequency and suffer additional damping as the temperature is decreased. At still lower temperatures in the B-italic phase an inversion of the spin-wave spectrum from one side of the N-italicM-italicR-italic line to the other is observed, agreeing quantitatively with the predictions of the 1975 theory of Combescot.

• Research Organization: Physics Department, Ohio State University, Columbus, Ohio
• OSTI ID: 5571049
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 63:5; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EVEN-ODD NUCLEI
FREQUENCY RANGE
HELIUM 3
HELIUM 3 A
HELIUM 3 A1
HELIUM 3 B
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MEDIUM PRESSURE
MHZ RANGE
MHZ RANGE 01-100
NUCLEAR MAGNETIC RESONANCE
NUCLEI
RESONANCE
SPIN WAVES
STABLE ISOTOPES
ULTRAHIGH VACUUM